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AMD Stats: Fragmented packets

matthew_eisengr
Inactive

I'm on a 12.3.4 environment and am seeing some dodgy results. When I check on the AMD stats I see 99% fragmented packets. Anybody know what the definition for that is and what is does to the performance data?

4 REPLIES 4

ulf_thornander3
Inactive

What driver does the AMD have?

What do you have on the wire - any Jumbopackets?

Hey Ulf,

One AMD is custom driver, the other is native.

I couldn't find any evidence of jumbo packets.

Per Wojciech's advice, I took a capture from each AMD and was not seeing the same results as that screenshot. I've opened a support ticket to investigate this discrepancy further.

So is the fragmentation on both drivers?

Can you disconnect the feed and do the capture there (i.e. - Before it hits the AMD) or from another (duplex) port in the Network Packet Broker?

wojciech_kurek
Inactive

The fragmented packets metric refers to IP fragmentation - i.e. IP packets with a MTU larger than the MTU of a network they crossed on their way, which caused them to be split into smaller packets by a router.

The AMD does not support reassembling IP fragments. A fragment rate of 99% is extremely high though. You should record a capture file on the AMD and examine it in Wireshark to see whether it really consists mainly of IP fragments.

Wojtek.